Background of the issue:
I use the Custom Fields for WooCommerce plugin. I managed to translate my questions via WPML. The site I need help with is hidden link.
Symptoms:
For certain questions, I have choice answers (radio button and checkbox). WPML does not offer to translate them.
I have checked and I can not see this plugin or our official compatible plugins list, so some issues may happen. (https://wpml.org/plugin/)
1) Have you checked with the plugin author if they are compatible and support WPML? Since we are not familiar with nor have worked compatibility for this plugin. You can also invite them to our GoGlobal program and we will be glad to help out in this process.
2) You can try to set these Custom fields post type as translatable and then manually translate them to 2nd language, and set correct translation names there, please check nxt guide: